LLTO
LLTO, short for lithium lanthanum titanate, is a ceramic oxide solid electrolyte with the chemical formula Li0.5La0.5TiO3. It adopts a perovskite-derived structure in which Li+ and La3+ occupy the A-site of the ABO3 lattice and Ti4+ sits at the B-site, with oxygen forming octahedra around Ti. The partial substitution of Li+ on the A-site creates a high concentration of lithium vacancies that facilitate ionic transport.
Electrical properties: LLTO exhibits relatively high lithium-ion conductivity for a ceramic electrolyte, with bulk conductivities on
Stability and challenges: LLTO is sensitive to moisture and can degrade under humid conditions. Its compatibility
Enhancement strategies: Aliovalent doping at the A-site (for example with Nb, Ta, or Al) and processing approaches
Applications and status: LLTO has been widely studied as a solid electrolyte candidate for all-solid-state lithium